Separable interlocking fasteneb



Aug. 11, 1936. o. VON DER HEYUE SEPARABLE INTERLOCKING FASTENER Filed Nov. 15, 1933 INVENTOR.

Patented Aug. 11, 1936 UN'ETED STATES PATENT FECEE Otto von der Heyde, Meadville, Pa., assignor to Hookless Fastener Company, a corporation 02 Pennsylvania Application November 15, 1933, Serial N0. 698,133

5 Claims. (C1. 24205) My lnvention relates to separable interlocking fasteners and more particularly to the fastening devices comprising a pair of flexible strips having cooperating series 0f fastener elements arranged in cl osely spaced relation on the edges of the strips, such elements being engaged 01' disengaged by a slider which is mounted to move over the elements.

Some of the objects of my invention are to provlde a light weight fastener which will be economical to produce am]. which will be satisfactory for many of the uses to which slide fasteners are now appli8d, to construct the fastener elements from thin sheet metal. and to have each element occupy a greater space (an the tape so that fewer elements will be required make a given length of fastener; to avoid the necessity of preparing a special beaded edge to receiVe the fastener elements; 130 make a compact cqn's'truction havlng the advantage of the slider-riding directly on the interlocking ends of 'ohge elements and not rubbing against the mountihg strips.

In the accompanying drawing, I.have shown,

for purpose of illustration, one embodimen which my lnvention may assume in practice.:. I this drawlng:

F 1 iS 8 P View 0f a st ner cgngtrud'fed. a, pair of flat tapes of uniform thickness through- "out their width, cooperating series cf fastener in accordance with my invention;

Fig. 2 1s a. cross-section on llne 22 of Fig. 1;

Fig. 3 1s a, perspective view o'f a. detached fastener element; a.nd

Flg. 4 shows the sheet metal blank from which the fastener element is made.

In Fig. 1 the mounting members 5 axe Ilat tapes without any speclal corded edge such as is usually required for securing the fastener elements in place. 'Ihe fastener elements 6 are attached in staggered relatlon to the adjacent edges of the tapes and are engaged a.nd disengaged by'means of the slider l, which is operated by the pull tab 8. Each fastener element has an interlocking end 9 of hollow cyllndrical form opn at one end, and having a polnted end I0 adapted to engage in the open end of an element in the opposite series when the fastener is interlocked.

Referring to Fig. 3, lt will be noted that; each cf the fastener elements is formed from a. piece 012 sheet metal bent upon itself to form the hollow cyllndrical portion 9 and relatively thin flat metal extensions II, I2, adapted to engage on opposlte sides of the flat tape as shown in Fig. 2. One of these fla.t metal extensions has a pointed end I3, shown more clearly in Fig. 4,. which pierces through the tape and is clinched over the opposite flat extension as shown in Fig. 2.

II: will be seen in Fig. 4 that the fla.t metal blank from which the fastener elements are formed is of genera lly rectangular cr0ss-section wit;h notches inone side. When the blank isbenf upon itself the cylindrical interlocking-portlon is madig 5 from the central part of the blank and the notches divide the pointed end I0 from the flat extensions. In other words, the flat attaching portions are substantially as wide as the overall length of the interlocklng portion. This is de- 10 sirable in order that there will not; be too much tape between fastener elements. While the stringers are quite flexible; a certain degree of resistance to relative twist'ing of the faste'ner elementS is desirable in order that they may enter 15 the c'ylincler properly. This can be controlled by. varying the space betw@en the fastener elements.

While} have shown and described.in this application, one embodiment which my invention may a ssume in practice, it; will be understoodthat 20 tlfisf embodiment is merely for the purposes of illustration and descriptlon and that various other f0tmgmay be devised within the scope of my inir entj ion as defined in the appended claims.

What I claim as my invention is:

1. In a fastening device cf the dass described,

elements an the adjacent edges of sa.id tapes, each elemenlg comprising a thin, flat, sheet metal member whose width is several times lts thickness bent upon itself and having the ends overlapping the flat edge of said tape, one of said ends having a pointed extension piercing the tape and bent over the opposite end Tor securing the fastener element firmly to the tape, and interlocking means formed at the bend projecting away from the edge of the stringer.

2. A fastening device of the dass described comprlsing a, pair of fiat tapes of uniform thickness throughout their width, cooperating series of fastener elements along the adjacent edges of sa.id tapes, each of said elements conSisting of an elongated, thin, sheet metal mexnber whose width is several times its thickness, and having interlocking portions projecting from the edges of said tape, and exigaging each other along the longitudinal central 1ine of the fastening device, each element having thin sheet melzal anchorage portions extending in paiallefrelation from the interlocking portion pf each element on opposite sides of and securegito one of the tapes, and a. slider embracing said interlocklng portions and sliding over said anchorage portions for opehing and closing the fastener so that seid anchorage portlons extend through t'he sides 015 the slides.

3. A fastening devlce of the class described comprising a pair 015 flat tapes, qooperatlng -series of fastener elements attached to adjacent edges o! sald tapes, each of sald fastener elements belng formed from a flat sheet metal blank of generally rectangular shape having notches in one side, said blank being bent upon itself lnto the Iorm 01 a cyllnder at the bend wlth a pointed conlcal extensiqn, and the end cf said blank forming flat extenslons from said cylinder, sald notches servlng to separate said pointed end from said flat extenslbns, and means on said flat extenslons for anchoring the fastener element tb the tape.

4. A fastenlng device 01' the dass described comprising a p'alr of tape stringers, interlocklng series of fastener elements along the edges o1 sald stringers, each element being tormed from a thln sheet metal blank bent upon ltse lf to provlde parallel end partions on' opposite Sides of the tape and a hollow enlarged-portion als the band, the wa lls of said enlarged portion belng spacecl apart a greater distance than' the parallel end portions and cut away from said parallel extenslons along.

one edge to provlde a pointed end or prong adapted to lnterlock in the space withln the bend 01 a corresponding member on the opposlte serles, and means for cllnching said end portions to the tape.

A fastenlng device cf the dass descrlbed comprlsing a. palr 01 flat tapes o! uniform thick ness throughout thelr width, cooperating series of fastener elements attached to adjacent edges 01 sald tapes, auch o1 said fastener elements being formed of a flal'. sheet metal blank of generally rectangular shape bent double to provlde parallel extenslons on opposite sides 01 the flat tape. means an said extenslons provldiug a secure counection to said tape, said fastener element having a hollow enlarged portion at the band whlch has walls spaced apart a greater dlstance than the parallel extensions, said hollow portion projecting a substantial distance Irom the edge of the stringer, the bent portlo n havlng notches in one slde therol', the material adjacent to sald notches at 20 the bend belng formed to provide a prong adapted to engage in the space between the benl: sides o1! a corresponding member on the oppdslte serles.

O'I'IQ .von nun HEYDE. 25' 

